<!DOCTYPE html>
<html>
<head>
</head>
<body>
<select style="width:200px; font:12px Arial;">
	<option>OPTION</option>
</select>
<br /><br />
<iframe name="ifr" frameborder="0" style="width:200px; height:100px;"></iframe>
<script>
window.onload = function () {
	var x = 0, y = 0, ifr = frames['ifr'];
	ifr.document.write('<body style="background:wheat;"><div style="width:2000px;height:1000px;"></div></body>');
	setInterval(function () {
		(x >= 2000 && y >= 1000) && (x = 0, y = 0);
		ifr.scroll(x+=20, y+=10);
	}, 50);
}
</script>
</body>
</html>